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Irish Lower Carboniferous (Dinantian Subsystem) carbonate rocks are extensively replaced by planar dolomite. This dolomitization is unrestricted in lithology replaced, age of host rock and geographical occurrence. This paper presents geochemical (δ18O, δ13C, 87Sr/86Sr, Sr conc.) modelling evidence, and discussion supporting and extending the theory that replacement planar dolomitization formed in the Waulsortian, and other host rocks under shallow burial conditions via interaction with a low-temperature (c. 50–70 °C) slightly modified seawater. The probable mechanism for transporting the fluid into the carbonates appears to be a variant of Kohout convection, driven...

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